DE102017117584A1 - Mixing plant and corresponding mixing process - Google Patents

Abstract

The invention relates to a mixing plant for mixing a plurality of components (eg coating agent components) in a predetermined mixing ratio to a mixture (for example coating mixture mixture, such as 2K paint). The mixing plant according to the invention comprises a shuttle valve arrangement (2) with a plurality of inlets (3) each having an individually controllable inlet valve (4) for supplying the components to be mixed and a common outlet (6) for the sequential delivery of the components to be mixed. In addition, the mixing plant according to the invention provides a metering cylinder (8) at the outlet (6) of the shuttle valve assembly (2), the metering cylinder (8) having a displaceable metering piston (9) and the components to be mixed corresponding to the piston movement of the metering piston (9) with a defined amount of charge from the outlet (6) receives the shuttle valve assembly (2) and merges in the metering cylinder (8) to adjust the predetermined mixing ratio. Furthermore, the invention comprises a corresponding mixing method.

Description

The invention relates to a mixing plant or mixing method for mixing a plurality of components (e.g., coating agent components) in a predetermined mixing ratio into a mixture (e.g., coating agent mixture), for example, for mixing plastics or blending a masterbatch with a hardener to form a two-component enamel.

Such mixing plants are known from the prior art in various embodiments, which are briefly described below.

For example, injection mixing systems are known in which a continuous stream of a first coating agent component is continuously measured. Upon reaching a certain minimum quantity of the coating agent component, a certain injection quantity of a second coating agent component is then injected into the stream. This process is then repeated continuously, so that the two coating agent components are combined with the desired mixing ratio. However, such injection mixing systems usually still require a static mixer in order to mix the coating composition more uniformly.

Furthermore, metering pump systems are known for mixing different coating agent components, in which metering pumps bring the various coating agent components together in a common channel, wherein the coating agent mixture is then usually passed through a static mixer in order to mix the coating agent components more uniformly. Here, the mixing ratio is adjusted by the flow rates of the metering pumps.

A modification of such metering pump systems are metering piston systems in which metering cylinders with displaceable metering pistons occur instead of metering pumps.

Furthermore, mixing chamber systems are known in which the individual coating agent components are introduced, for example, by metering pumps or dosing into a mixing chamber and mixed there, for example, by a stirrer. Such a mixing chamber system is for example out EP 0 334 092 A1 known.

Finally is off DE 10 2015 008 659 A1 a mixing device is known, which can be integrated into a nebulizer. In this case, a shuttle valve arrangement selects the coating agent components to be mixed and brings them together at the outlet of the shuttle valve arrangement, wherein the coating agent mixture is then passed through a static mixer (eg lattice mixer, spiral mixer).

However, the known mixing devices described above are not yet completely satisfactory.

The invention is therefore based on the object to provide an improved mixing plant or a corresponding mixing method.

This object is achieved by a mixing plant or a mixing process according to the independent claims.

The mixing plant according to the invention is suitable for mixing a plurality of coating agent components in a predetermined mixing ratio to form a coating agent mixture. For example, the mixing plant according to the invention can be used to mix a master paint with a hardener to form a two-component paint. However, the invention is not limited to master lacquer and hardener with respect to the type of the coating agent components to be mixed. Rather, the invention is also suitable for mixing other types of coating agent components. It should also be mentioned that the invention is not limited to exactly two coating agent components with regard to the number of coating agent components to be mixed. Rather, the invention is also suitable for mixing a larger number of coating agent components.

In addition, the invention is also suitable for mixing other components than coating agent components. For example, the components to be mixed may be plastics. For example, milky plastisols in the toy industry can be colored by mixing base color pigments to achieve the desired hue. Another example is adhesives that are colored to avoid certain color contrasts in joints of edges. In the following, however, for the sake of simplicity, the concrete term "coating agent components" is used, but this is not intended to be limiting.

The mixing plant according to the invention initially according to the prior art according to DE 10 2015 008 659 A1 a shuttle valve assembly having a plurality of inlets for supplying the coating agent components to be mixed and a common outlet for dispensing the coating agent components to be mixed.

Preferably, the shuttle valve assembly not only serves to control the material flow for the individual coating agent components, but also to select the coating agent components to be mixed from a variety of available coating agent components. For example, it is conceivable that the shuttle valve assembly selects one of numerous master paints and merges with a common or an individually suitable hardener.

It should be noted that the shuttle valve assembly preferably sequentially dispenses the coating agent components to be mixed at the outlet, i. without a temporal overlap. At the outlet of the shuttle valve arrangement so preferably no coating agent mixture is dispensed. Rather, the coating agent components to be mixed at the outlet of the shuttle valve arrangement preferably emerge sequentially and unmixed.

The mixing plant according to the invention is now characterized by a metering cylinder which is connected to the outlet of the shuttle valve arrangement and receives the coating agent components to be mixed from the shuttle valve arrangement. In the metering cylinder is a displaceable metering piston, which is displaced during filling of the metering cylinder, so that the piston movement of the metering piston defines the filling amount of the respective coating agent component. The coating agent components to be mixed are thus selected by the shuttle valve arrangement, supplied to the metering cylinder and combined in the metering cylinder.

The term used in the invention of a metering cylinder is generally understood and not limited to a metering cylinder with an exactly circular inner cross section. Rather, the dosing and the metering can also have any other cross-sections. All that matters is that the metering piston is displaceable in the metering cylinder in order to define the filling quantity of the respective coating agent.

In a preferred embodiment of the invention, a metering drive is provided to move the metering piston in the metering cylinder according to the defined filling quantity of the respective coating agent. In this context, it should be mentioned that the term of a metering cylinder used in the context of the invention preferably implies that the respective filling quantity of the respective coating agent component can be precisely adjusted, which corresponds to the term metering.

Preferably, the metering drive comprises an electric motor (e.g., servomotor) which can act on the metering piston via a helical gear (e.g., ball screw gear) or via a toothed belt.

Furthermore, it is advantageous if the metering drive has a rotary encoder which measures the angle of rotation of the electric motor, wherein the angle of rotation of the electric motor also defines the filling quantity. The rotary encoder thus indirectly enables an accurate measurement of the filling quantity of the respective coating agent component. Therefore, the rotary encoder preferably has a very large angular resolution in order to achieve a high dosing accuracy. The angular resolution of the rotary encoder can therefore be in the invention at least 2000, 4000, 8000, 16000, 32000, 64000 or even at least 128,000 increments per revolution in order to achieve a correspondingly high dosing accuracy.

In addition, there is the possibility within the scope of the invention that a shaft and / or a piston rod made of an electrically insulating material is arranged kinematically between the electric motor and the metering piston in order to enable potential separation. This is advantageous in particular when the coating agent mixture for an electrostatic coating agent charging is to be charged electrically.

The dosing drive preferably allows - as already briefly mentioned above - a high dosing accuracy with very low Dosierfehlern. For example, the dosing errors may be less than ± 10ml, ± 5ml, ± 2ml, ± 1ml, ± 500nl, ± 200nl or even ± 100nl.

As an alternative to the above-mentioned electric drive of the metering drive, there is also the possibility that the metering drive operates pneumatically or hydraulically.

It has already been briefly mentioned above that the metering cylinder is connected to the outlet of the shuttle valve assembly, i. the metering cylinder is filled from the outlet of the shuttle valve assembly. Preferably, a controllable shut-off valve is arranged between the outlet of the shuttle valve assembly and the metering cylinder to control the material delivery from the shuttle valve assembly into the metering cylinder.

The metering cylinder then delivers the premixed coating agent mixture to an application device, it being possible to arrange a controllable outlet valve and / or a static mixer (eg lattice mixer, spiral mixer) between the metering cylinder and the application device static mixer has the task to mix more uniformly from the dosing cylinder only premixed coating agent components.

Furthermore, the mixing plant according to the invention can have a material return in order to receive coating agent residues from the metering cylinder during a flushing process. For example, this material recycling can have a collecting container for the coating agent residues.

In this case, a controllable flushing agent valve is preferably provided in order to control the supply of flushing agent into the metering cylinder.

In addition, a controllable return valve may be provided to control the discharge of material from the metering cylinder in the material recirculation.

In the context of the invention, there is also the possibility that downstream of the shuttle valve arrangement a plurality of metering cylinders and / or a plurality of static mixers are arranged one behind the other in the flow direction, which also enables potential separation. The individual metering cylinders are preferably each assigned a flushing agent valve, a return valve, a shut-off valve and / or an outlet valve.

However, the connection of the material recirculation can take place differently with the different metering cylinders. Thus, the material return can be connected to the associated return valve in the upstream metering directly to the metering cylinder. In contrast, in the downstream metering cylinder, the static mixer can be arranged between metering cylinder and material return.

Furthermore, it should be mentioned that the mixing plant according to the invention is suitable for a very large viscosity range, i. Coating agent components with very different viscosities can be mixed. For example, the viscosity bandwidth may be 15MPa · s to 10000MPa · s.

In addition to the mixing plant described above, the invention also claims protection for a corresponding mixing process, wherein the individual process steps of the mixing process according to the invention already emerge from the description and therefore need not be described separately.

It should be noted, however, that for mixing the coating agent components in the metering cylinder or for dissolving coating agent residues in the metering cylinder, it is possible to move the metering piston back and forth in a jerky manner. During this jerky reciprocating movement of the metering piston, turbulences are created in the metering cylinder, which contribute to the thorough mixing of the coating agent components or to the dissolution of coating agent residues during a flushing process.

The reciprocating movement of the metering piston can be achieved, for example, by filling a residual volume of air into the metering cylinder in addition to the coating agent components or the flushing agent to be mixed. The metering drive is then turned on to compress the air in the metering cylinder. When the metering drive is switched off, the metering piston is then released, so that the compressed air can jerk back the metering piston, as a result of which turbulences develop in the metering cylinder, which contribute to improving the diameter or to dissolving the coating agent residues in the metering cylinder. The air can then be drained from the dosing cylinder, for example.

It should also be mentioned that the various coating agent components to be mixed are preferably introduced into the metering cylinder in a specific sequence.

For example, the order of filling of the metering cylinder can be based on the viscosity of the coating agent components to be filled. Preferably, the filling of low-viscosity coating agent components is started in this case, in order then to proceed with the filling of higher-viscosity coating agent components.

Alternatively, it is also possible that the order of filling of the various coating agent components is oriented to the respective filling amount, preferably starting with a filling of small quantities and continued with a filling of large quantities.

Finally, there is also the possibility that first base lacquer is filled while the hardener is last filled.

• 1 eine schematische Darstellung einer erfindungsgemäßen Mischanlage,
• 2 eine Abwandlung von 1 mit zwei Dosierzylindern und zwei statischen Mischern,
• 3 eine schematische Darstellung des erfindungsgemäßen Mischverfahrens in Form eines Flussdiagramms,
• 4A und 4B eine Abwandlung des Flussdiagramms gemäß 3,
• 5 ein Flussdiagramm zur Verdeutlichung der Verbesserung der Durchmischung durch ein ruckartiges Hin- und Herbewegen des Dosierkolbens, und
• 6 ein Flussdiagramm zur Verdeutlichung der Verbesserung der Spülwirkung durch ruckartiges Hin- und Herbewegen des Dosierkolbens.

Other advantageous developments of the invention are characterized in the subclaims or are explained in more detail below together with the description of the preferred embodiments of the invention with reference to FIGS. Show it:

• 1 a schematic representation of a mixing plant according to the invention,
• 2 a modification of 1 with two dosing cylinders and two static mixers,
• 3 a schematic representation of the mixing method according to the invention in the form of a flow chart,
• 4A and 4B a modification of the flowchart according to 3 .
• 5 a flow chart to illustrate the improvement of the mixing by a jerky reciprocation of the metering, and
• 6 a flow chart illustrating the improvement of the flushing effect by jerky reciprocating the metering piston.

1 shows an embodiment of a mixing plant according to the invention for mixing a plurality of coating agent components (for example, hardener and various basecoats) to a coating composition mixture, which then from an application device 1 (For example, atomizer) can be applied to a component (eg motor vehicle body component).

For this purpose, the mixing plant according to the invention initially has a shuttle valve arrangement 2 with numerous inlets 3 to supply the coating agent components to be mixed. For example, via the inlets 3 the shuttle valve assembly 2 several different basecoats and a hardener are supplied.

The individual inlets 3 the shuttle valve assembly 2 is each an inlet valve 4 assigned to the material flow from the individual inlets 3 in a common channel 5 towards an outlet 6 the shuttle valve assembly 2 to control.

The outlet 6 the shuttle valve assembly 2 is via a shut-off valve 7 with a dosing cylinder 8th connected.

In the dosing cylinder 8th is a dosing piston 9 from a dosing drive 10 displaceable with a servomotor, wherein the metering drive 10 via an electrically insulating piston rod 11 on the dosing piston 9 acts. The electrically insulating piston rod 11 this enables a potential separation in the context of an electrostatic coating agent charging.

The dosing cylinder 8th is via an exhaust valve 12 , a static mixer 13 (eg lattice mixer, spiral mixer) and a main valve 14 with the application device 1 connected.

In addition, the mixing plant still has a flushing valve 15 to, in a flushing detergent into the dosing 8th initiate.

Furthermore, the mixing plant comprises a material recycling 16 placed in a collection container 17 empties.

Between the collection container 17 and the dosing cylinder 8th Here is still a controllable return valve 18 arranged to discharge the material from the dosing cylinder 8th in the collection container 17 to control.

The mode of operation of the mixing plant will now be described below, with reference to the flowchart according to FIG 3 Reference is made.

In a first step S1 becomes the dosing piston 9 moved to a discharge position, ie in the drawing in the upper position. Furthermore, the flushing valve 15 , the return valve 18 and the exhaust valve 12 closed while the shut-off valve 7 between the shuttle valve assembly 2 and the dosing cylinder 8th is opened.

In one step S2 then becomes the desired inlet valve 4 opened, wherein initially a low-viscosity coating agent component A is selected.

In a next step S3 becomes the dosing piston 9 then from the dosing drive 10 controlled such that a defined volume V _{A of} the selected coating agent component A in the metering cylinder 8th is filled.

In a further step S4 Then, the inlet valve for the low-viscosity coating agent component A is closed and another inlet valve for a high-viscosity coating agent component B is in one step S5 open.

In one step S6 becomes the dosing piston 9 then controlled in such a way that again a defined volume V _{B of} the coating agent component B in the metering cylinder 8th is sucked.

In one step S7 Then, the inlet valve for the high-viscosity coating agent component B is closed.

In one step S8 then becomes the shut-off valve 7 closed, whereas the exhaust valve 12 is opened.

The metering piston 9 will be in one step S9 controlled process and presses while in the dosing 8th pre-mixed coating agent mixture A + B from the metering cylinder 8th through the static mixer 13 towards the application device 1 ,

In a next step S10 then becomes the exhaust valve 12 closed while the flushing valve 15 and the return valve 18 be opened.

In one step S11 then becomes the dosing cylinder 8th rinsed. It is about the flushing valve 15 Rinsing agent introduced into the metering cylinder, thereby coating residues removed and the open recirculation valve 18 in the collection container 17 be directed.

In one step S12 then the flushing valve 15 and the return valve 18 closed.

The 4A and 4B show a modification of the mixing method according to 3 , so that reference is made to avoid repetition of the above description.

A special feature of this embodiment is that in each case not the complete quantities V _A and V _B in the metering cylinder 8th be filled. Rather, in the steps S3 respectively. S6 only partial volumes V _A / x and V _B / x of the desired filling amounts in the metering cylinder 8th filled. The filling with the partial volumes V _A / x and V _B / x is cyclically repeated until the desired total quantities V _A and V _B are filled in the metering cylinder. By this procedure, the degree of mixing during filling of the metering cylinder 8th improved.

5 shows in the form of a flow chart a variant according to the invention for improving the mixing of the various coating agent components in the metering cylinder. Here, the dosing is 8th first in one step S1 filled with the desired coating agent components.

Then it will be in one step S2 a residual volume of air in the metering cylinder 8th filled.

In one step S3 then become the shut-off valve 7 , the exhaust valve 12 , the flushing valve 15 and the return valve 18 closed.

In one step S4 then a counter i = 0 is initialized.

In the next step S5 then becomes the metering piston 9 from the metering drive 10 so moved that the volume of air in the dosing cylinder 8th is compressed.

In one step S6 becomes the metering drive 10 then turned off. This has the consequence that the metering piston 9 is released, so that the compressed air the metering piston 9 jump back jerkily. This jerky jumping back of the metering produced in the metering cylinder 8th Turbulence, which contributes to an improvement of the mixing of the coating agent components.

In one step S7 then the counter i = i + 1 is incremented.

In one step S8 It is then checked whether the desired number i _MAX of mixing operations is reached.

If this is the case, then in one step S9 the outlet valve 12 opened and the coating agent mixture can from the metering cylinder 8th to the application device 1 be directed.

The jerky back and forth movement of the metering piston 9 not only can be used to intermix the coating agent components in the metering cylinder 8th to improve. Rather, the jerky back and forth movement of the metering piston is suitable 9 Also, in a rinsing process, the detachment of coating residues from the inner walls of the dosing 8th to improve, as in 6 is shown. The flowchart according to 6 is thus largely consistent with the flowchart 5 so as to avoid repetition essentially to the above description 5 can be referenced.

It is only to mention that the metering cylinder 8th This is filled with a mixture of detergent, air and coating residues. Then then the metering piston 9 jerky back and forth, as already above 5 has been described.

2 shows a modification of the embodiment according to 1 , so that in order to avoid repetition, reference is made to the above description, wherein the same reference numerals are used for corresponding details, which are, however, provided with the addition ".1" or ".2" for the purpose of distinction.

A special feature of this embodiment is that in this case two dosing 8.1 . 8.2 and two static mixers 13.1 . 13.2 are connected in series. This serves to improve the mixing and allows complete electrical isolation.

It should also be mentioned that the material recycling 16.2 with the return valve 18.2 not directly to the downstream metering cylinder 8.2 connected, as is the case with the metering cylinder 8.1 the case is. Rather, this is between the material recycling 16.2 and the dosing cylinder 8.2 the static mixer 13.2 arranged.

The invention is not limited to the preferred embodiments described above. Rather, a variety of variants and modifications is possible, which also make use of the inventive idea and therefore fall within the scope. In particular, the invention also claims protection for the subject matter and for the features of the subclaims independently of the claims in each case referred to and in particular without the features of the main claim. The subclaims and the description thus encompass various aspects of the invention which enjoy protection independently of each other.

LIST OF REFERENCE NUMBERS

1

applicator

2

Changer valve assembly

3

Inlets of the shuttle valve assembly

4

Inlet valves of the shuttle valve assembly

5

Common channel of shuttle valve assembly

6

Outlet of the shuttle valve assembly

7, 7.1, 7.2

shut-off valve

8,8.1,8.2

metering

9, 9.1, 9.2

dosing

10, 10.1, 10.2

metering

11, 11.1, 11.2

piston rod

12, 12.1, 12.2

outlet valve

13, 13.1, 13.2

static mixer

14

main valve

15, 15.1, 15.2

detergent valve

16, 16.1, 16.2

Material recycling

17, 17.1, 17.2

Collection container of material recycling

18, 18.1, 18.2

Recirculation valve

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 0334092 A1 [0006]
• DE 102015008659 A1 [0007, 0013]

Claims (15)

Mixing plant for mixing a plurality of components, in particular coating agent components, in a predetermined mixing ratio to a mixture, in particular to a coating mixture mixture, in particular for mixing a parent lacquer with a hardener to a two-component lacquer, with a) a shuttle valve assembly (2) having a plurality of inlets (3) in each case an individually controllable inlet valve (4) for supplying the components to be mixed and a common outlet (6) for discharging the components to be mixed, in particular for the sequential delivery of the components to be mixed, characterized by b) a metering cylinder (8, 8.1, 8.2) at the outlet (6) of the shuttle valve arrangement (2), the dosing cylinder (8; 8.1, 8.2) having a displaceable metering piston (9, 9.1, 9.2) and the components to be mixed corresponding to the piston movement of the metering piston (9, 9.1, 9.2) with a defined capacity from the outlet (6) of the Wechselventilanordnun g (2) receives and in the metering cylinder (8; 8.1, 8.2) merges to set the predetermined mixing ratio. Mixing plant after Claim 1 , Characterized in a) that a metering drive (10; 10.1, 10.2) is provided (to move the dosing piston 9; 9.1, 9.2) (in the metering cylinder 8; 8.1, 8.2) according to the defined capacity of the particular coating composition, and / or b) that the metering drive (10; 10.1, 10.2) has an electric motor, in particular a servomotor, and / or c) that the electric motor is connected to the metering piston (9, 9.1, 9.2) via a helical gear, in particular via a ball screw drive or via a toothed belt ), and / or d) that the metering drive (10; 10.1, 10.2) has a rotary encoder which measures a rotation angle of the electric motor, in particular with an angular resolution of at least 2000, 4000, 8000, 16000, 32000, 64000 or 128000 increments per Rotation in order to achieve a high dosing accuracy, and / or e) that kinematically between the electric motor and the metering piston (9, 9.1, 9.2) a shaft and / or a piston rod (11, 11.1, 11.2) from an elec is arranged electrically insulating material to enable potential separation, and / or f) that the metering drive (10; 10.1, 10.2) a high dosing accuracy allows with dosing errors of less than ± 10ml, ± 5ml, ± 2ml, ± 1ml, ± 500nl, ± 200nl or ± 100nl, and / or g) that the metering drive (10; 10.1, 10.2) pneumatically or works hydraulically. Mixing installation according to one of the preceding claims, characterized by a) a controllable shut-off valve (7; 7.1, 7.2) between the outlet (6) of the shuttle valve arrangement (2) and the metering cylinder (8; 8.1, 8.2) for controlling the material delivery from the shuttle valve arrangement (7). 2) in the metering cylinder (8, 8.1, 8.2), and / or b) a controllable outlet valve (12, 12.1, 12.2) for controlling the material delivery from the metering cylinder (8, 8.1, 8.2) to an application device (1). Mixing installation according to one of the preceding claims, characterized by a) a material return (16, 16.1, 16.2), in particular with a collecting container (17, 17.1, 17.2), for receiving coating agent residues from the metering cylinder (8, 8.1, 8.2) during a flushing operation , b) a controllable flushing agent valve (15, 15.1, 15.2) for supplying flushing agent into the metering cylinder (8, 8.1, 8.2), and / or c) a controllable return valve (18, 18.1, 18.2) for controlling the material delivery from the metering cylinder (8; 8.1, 8.2) into the material return (16, 16.1, 16.2). Mixing installation according to one of the preceding claims, characterized by a static mixer (13; 13.1, 13.2) which is connected on the input side to the metering cylinder (8; 8.1, 8.2) and through which the premixed coating agent mixture flows in order to mix the coating agent mixture more uniformly. Mixing installation according to one of the preceding claims, characterized in that a) downstream of the shuttle valve arrangement (2) a plurality of metering cylinders (8.1, 8.2) and / or a plurality of static mixers (13.1, 13.2) are arranged one behind the other in the flow direction, and / or b) that the dosing cylinder (8.1, 8.2) allow potential separation. Mixing plant after Claim 6 , characterized in that a) that the individual metering cylinders (8.1, 8.2) can be flushed independently of one another by a controllable flushing agent valve (15.1, 15.2), and / or b) that the individual metering cylinders (8.1, 8.2) are each provided with a controllable return valve (8). 18.1, 18.2) can be flushed out into a common material return or in a separate material return (16.1, 16.2), and / or c) that the individual metering cylinders (8.1, 8.2) each have a controllable shut-off valve (7.1, 7.2) on the input side, and / or d) that the individual metering cylinders (8.1, 8.2) each have a controllable outlet valve (12, 12.1, 12.2) on the outlet side, and / or e) that in the upstream metering cylinder (8.1) the material return (16.1) is connected directly to the metering cylinder (8.2), while in the downstream metering cylinder (8.2) of the downstream static mixer (13.2) between the downstream material return (16.2) and the downstream metering cylinder (8.2) is connected. Mixing method for mixing a plurality of components, in particular coating agent components, in a predetermined mixing ratio to a mixture, in particular to a coating mixture mixture, in particular for mixing a parent lacquer with a hardener to a two-component lacquer, in particular by means of a mixing plant according to one of the preceding claims, comprising the following steps: a ) Selecting the components to be mixed by means of a shuttle valve assembly (2) with a plurality of inlets (3) on which each of the individual components abut, the respective selected components are a common outlet (6) of the shuttle valve assembly (2) supplied, in particular sequentially, characterized by the following step: b) filling a dosing cylinder (8, 8.1, 8.2) with a displaceable dosing piston (9, 9.1, 9.2) corresponding to the piston movement of the dosing piston (9, 9.1, 9.2), each with a certain filling quantity of the various components the outlet (6) of the shuttle valve assembly (2), so that the components to be mixed in the metering cylinder (8; 8.1, 8.2) are brought together. Mixing method after Claim 8 , characterized in that a) that the various components of the shuttle valve assembly (2) sequentially selected and the outlet (6) of the shuttle valve assembly (2) are supplied sequentially, and / or b) that the metering cylinder (8; 8.1, 8.2) sequentially the various components are filled, so that the various components in the metering cylinder (8; 8.1, 8.2) are combined and premixed, and / or c) that the metering cylinder (8; 8.1, 8.2) fills sequentially and repeatedly with subsets of the various components is filled for each of the components to be mixed, the desired total amount in the metering cylinder (8; 8.1, 8.2). Mixing method after Claim 9 , characterized in that the metering piston (9; 9.1, 9.2) during the filling of the metering cylinder (8; 8.1, 8.2) with the various components of a metering drive (10; 10.1, 10.2) is controlled to a defined amount of charge of the respective component in the dosing (8, 8.1, 8.2) record. Mixing method after Claim 9 or 10 characterized by the step of: emptying the metering cylinder (8; 8.1, 8.2) with the mixture therein into a static mixer towards an application device (1) so that the mixture is more uniformly mixed in the static mixer. Mixing method according to one of Claims 9 to 11 characterized by the following step for premixing the various components in the metering cylinder (8; 8.1, 8.2) or for releasing residues in the metering cylinder (8; 8.1, 8.2) during a flushing operation: repeated reciprocating movement of the metering piston (9; 9.1 , 9.2), in particular jerky, for generating turbulence in the metering cylinder (8, 8.1, 8.2). Mixing method after Claim 12 characterized by the following steps for reciprocating the metering piston (9, 9.1, 9.2) in the metering cylinder (8, 8.1, 8.2): a) filling a residual volume of the metering cylinder (8, 8.1, 8.2) in addition to the components to be mixed b) switching on a metering drive (10; 10.1, 10.2) so that the metering piston (9; 9.1, 9.2) is moved and compresses the air in the metering cylinder (8; 8.1, 8.2), and c) Switching off the metering drive (10, 10.1, 10.2) so that the compressed air in the metering cylinder (8, 8.1, 8.2) makes the metering piston (9, 9.1, 9.2) spring back, causing turbulence in the metering cylinder (8, 8.1, 8.2) and the components are premixed in the metering cylinder (8, 8.1, 8.2) or the residues in the metering cylinder (8, 8.1, 8.2) are released, and d) Preferably, venting the air from the metering cylinder (8, 8.1, 8.2) via a drain valve. Mixing method according to one of Claims 9 to 13 , characterized by the following steps for rinsing the dosing cylinder (8, 8.1, 8.2): a) flushing in a rinsing agent into the dosing cylinder (8, 8.1, 8.2), in particular via a controllable rinsing agent valve (15, 15.1, 15.2), for dissolving residues 8.1, 8.2), and / or b) rinsing out the residues of the mixture from the metering cylinder (8, 8.1, 8.2) into a material return (16, 16.1, 16.2), in particular with a collecting container, in particular via a controllable return valve. Mixing method according to one of Claims 9 to 14 , characterized in that the components to be mixed in a predetermined order in the metering cylinder (8; 8.1, 8.2) are filled, namely a) according to the viscosity of the components starting with a low-viscosity component followed by a higher-viscosity component, or b) corresponding to the filling amount of the individual components starting with a small-capacity component followed by a high-capacity component, or c) followed by starting with the stock paint from the hardener.

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